2193749809 has 4 divisors (see below), whose sum is σ = 2193957360. Its totient is φ = 2193542260.

The previous prime is 2193749801. The next prime is 2193749837. The reversal of 2193749809 is 9089473912.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2193749809 - 2³ = 2193749801 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2193749801) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 87019 + ... + 109360.

It is an arithmetic number, because the mean of its divisors is an integer number (548489340).

Almost surely, 2^2193749809 is an apocalyptic number.

It is an amenable number.

2193749809 is a deficient number, since it is larger than the sum of its proper divisors (207551).

2193749809 is a wasteful number, since it uses less digits than its factorization.

2193749809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 207550.

The product of its (nonzero) digits is 979776, while the sum is 52.

The square root of 2193749809 is about 46837.4829490228. The cubic root of 2193749809 is about 1299.3586203016.

The spelling of 2193749809 in words is "two billion, one hundred ninety-three million, seven hundred forty-nine thousand, eight hundred nine".